| 摘要 |
<p>A method of making a composition for forming an article having increased barrier properties to gases and vapours comprises the step of mixing together a polar resin with a high purity talc filler. The talc filler has a percentage reflectance at 500nm of at least 85%, and is capable of delaminating when the composition is subjected to high shear. Preferably, the aspect ratio of the filler increases, ideally by a factor of at least two, as it breaks down into platelets. The resin may be ethylene - vinyl alcohol, polymide, poly(ethylene terephthalate), polyketone or poly ( butylene terephthalate ). A laminate article may include a barrier layer formed from the composition, the article being e.g. a coextruded tube, or multilayered strip which may be incorporated in a toothpaste tube.</p> |
